// Copyright (c) 2020-2021 Drew Lemmy
// This file is part of KristWeb 2 under GPL-3.0.
// Full details: https://github.com/tmpim/KristWeb2/blob/master/LICENSE.txt
import { useSelector, shallowEqual } from "react-redux";
import { RootState } from "@store";

import { Contact, ContactMap } from ".";

export type ContactAddressMap = Record<string, Contact>;

export interface ContactsHookResponse {
  contacts: ContactMap;
  contactAddressMap: ContactAddressMap;

  contactAddressList: string[];
  joinedContactAddressList: string;
}

/** Hook that fetches the contacts from the Redux store. */
export function useContacts(): ContactsHookResponse {
  const contacts = useSelector((s: RootState) => s.contacts.contacts, shallowEqual);
  const contactAddressMap = Object.values(contacts)
    .reduce((o, contact) => ({ ...o, [contact.address]: contact }), {});

  const contactAddressList = Object.keys(contactAddressMap);
  const joinedContactAddressList = contactAddressList.join(",");

  return {
    contacts, contactAddressMap,
    contactAddressList, joinedContactAddressList
  };
}